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Yes, most people check valve timing to determine timing chain stretch. In your case, since the power is so wildly irregular, it would be done to verify that the cam is in the correct position. This needs to be done with the injection pump as well to verify that the injection event is properly set. Drip timing is what most people do. You can read about that online or in the manual.
Something's just not right. You have to do a few broad scope checks to see which thing is the issue.
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